In order to get your level 90 to zone properly you have to be invited by another level 90 (If they aren't, you will end up pulling them to your server). A way around having to have a level 90 realID friend on every server you want to check is this.
You need 2 accounts to do this.
1) Have your 2 accounts linked via real ID.
2) Create a level 1 on your alt account on another server.
3) Get a level 90 to invite your level 1 to a group.
4) Have your level 1 promoted to leader
5) Invite your main.
6) Profit.
-edit - This still requires having the 90 stay in your party long enough to kill whichever elite you are camping, merely works around having to have a real ID buddy on every server.